TBL(1) TBL(1)
NAME
tbl - format tables for troff
SYNOPSIStbl [ -Cv ] [ files... ]
DESCRIPTION
This manual page describes the GNU version of tbl, which is part of the
groff document formatting system. tbl compiles descriptions of tables
embedded within troff input files into commands that are understood by
troff. Normally, it should be invoked using the -t option of groff.
It is highly compatible with Unix tbl. The output generated by GNU tbl
cannot be processed with Unix troff; it must be processed with GNU
troff. If no files are given on the command line, the standard input
will be read. A filename of - will cause the standard input to be
read.
OPTIONS-C Enable compatibility mode to recognize .TS and .TE even when
followed by a character other than space or newline. Leader
characters (\a) are handled as interpreted.
-v Print the version number.
USAGEtbl expects to find table descriptions wrapped in the .TS (table start)
and .TE (table end) macros. The line immediately following the .TS
macro may contain any of the following global options (ignoring the
case of characters -- Unix tbl only accepts options with all characters
lowercase or all characters uppercase):
center Centers the table (default is left-justified). The alternative
keyword name centre is also recognized (this is a GNU tbl exten-
sion).
delim(xy)
Use x and y as start and end delimiters for eqn(1).
expand Makes the table as wide as the current line length.
box Encloses the table in a box.
doublebox
Encloses the table in a double box.
allbox Encloses each item of the table in a box.
frame Same as box (GNU tbl only).
doubleframe
Same as doublebox (GNU tbl only).
tab(x) Uses the character x instead of a tab to separate items in a
line of input data.
linesize(n)
Sets lines or rules (e.g. from box) in n-point type.
nokeep Don't use diversions to prevent page breaks (GNU tbl only).
Normally tbl attempts to prevent undesirable breaks in the table
by using diversions. This can sometimes interact badly with
macro packages' own use of diversions, when footnotes, for exam-
ple, are used.
decimalpoint(c)
Set the character to be recognized as the decimal point in
numeric columns (GNU tbl only).
nospaces
Ignore leading and trailing spaces in data items (GNU tbl only).
The global options must end with a semicolon. There might be white-
space after an option and its argument in parentheses.
After global options come lines describing the format of each line of
the table. Each such format line describes one line of the table
itself, except that the last format line (which you must end with a
period) describes all remaining lines of the table. A single key char-
acter describes each column of each line of the table. You may run
format specs for multiple lines together on the same line by separating
them with commas.
You may follow each key character with specifiers that determine the
font and point size of the corresponding item, that determine column
width, inter-column spacing, etc.
The longest format line defines the number of columns in the table;
missing format descriptors at the end of format lines are assumed to be
`L'. Extra columns in the data (which have no corresponding format
entry) are ignored.
The available key characters are:
c,C Centers item within the column.
r,R Right-justifies item within the column.
l,L Left-justifies item within the column.
n,N Numerically justifies item in the column: Units positions of
numbers are aligned vertically.
s,S Spans previous item on the left into this column.
a,A Centers longest line in this column and then left-justifies all
other lines in this column with respect to that centered line.
^ Spans down entry from previous row in this column.
_,- Replaces this entry with a horizontal line.
= Replaces this entry with a double horizontal line.
| The corresponding column becomes a vertical rule (if two of
these are adjacent, a double vertical rule).
A vertical bar to the left of the first key-letter or to the right of
the last one produces a line at the edge of the table.
Here are the specifiers that can appear in suffixes to column key let-
ters:
b,B Short form of fB (make affected entries bold).
i,I Short form of fI (make affected entries italic).
t,T Start an item vertically spanning rows at the top of its range
rather than vertically centering it.
d,D Start an item vertically spanning rows at the bottom of its
range rather than vertically centering it (GNU tbl only).
v,V Followed by a number, this indicates the vertical line spacing
to be used in a multi-line table entry. If signed, the current
vertical line spacing is incremented or decremented (using a
signed number instead of a signed digit is a GNU tbl extension).
A vertical line spacing specifier followed by a column separa-
tion number must be separated by one or more blanks. No effect
if the corresponding table entry isn't a text block.
f,F Either of these specifiers may be followed by a font name
(either one or two characters long), font number (a single
digit), or long name in parentheses (the last form is a GNU tbl
extension). A one-letter font name must be separated by one or
more blanks from whatever follows.
p,P Followed by a number, this does a point size change for the
affected fields. If signed, the current point size is incre-
mented or decremented (using a signed number instead of a signed
digit is a GNU tbl extension). A point size specifier followed
by a column separation number must be separated by one or more
blanks.
w,W Minimal column width value. Must be followed either by a
troff(1) width expression in parentheses or a unitless integer.
If no unit is given, en units are used. Also used as the
default line length for included text blocks. If used multiple
times to specify the width for a particular column, the last
entry takes effect.
x,X This is a GNU tbl extension. Either of these specifiers may be
followed by a macro name (either one or two characters long), or
long name in parentheses. A one-letter macro name must be sepa-
rated by one or more blanks from whatever follows. The macro
which name can be specified here must be defined before creating
the table. It is called just before the table's cell text is
output. As implemented currently, this macro is only called if
block input is used, that is, text between `T{' and `T}'. The
macro should contain only simple troff requests to change the
text block formatting, like text adjustment, hyphenation, size,
or font. The macro is called after other cell modifications
like b, f or v are output. Thus the macro can overwrite other
modification specifiers.
e,E Make equally-spaced columns.
u,U Move the corresponding column up one half-line.
z,Z Ignore the corresponding column for width-calculation purposes.
A number suffix on a key character is interpreted as a column separa-
tion in ens (multiplied in proportion if the expand option is on).
Default separation is 3n.
The format lines are followed by lines containing the actual data for
the table, followed finally by .TE. Within such data lines, items are
normally separated by tab characters (or the character specified with
the tab option). Long input lines can be broken across multiple lines
if the last character on the line is `\' (which vanishes after concate-
nation).
A dot starting a line, followed by anything but a digit is handled as a
troff command, passed through without changes. The table position is
unchanged in this case.
If a data line consists of only `_' or `=', a single or double line,
respectively, is drawn across the table at that point; if a single item
in a data line consists of only `_' or `=', then that item is replaced
by a single or double line, joining its neighbours. If a data item
consists only of `\_' or `\=', a single or double line, respectively,
is drawn across the field at that point which does not join its neigh-
bours.
A data item consisting only of `\Rx' (`x' any character) is replaced by
repetitions of character `x' as wide as the column (not joining its
neighbours).
A data item consisting only of `\^' indicates that the field immedi-
ately above spans downward over this row.
A text block can be used to enter data as a single entry which would be
too long as a simple string between tabs. It is started with `T{' and
closed with `T}'. The former must end a line, and the latter must
start a line, probably followed by other data columns (separated with
tabs). By default, the text block is formatted with the settings which
were active before entering the table, possibly overridden by the v and
w tbl specifiers. For example, to make all text blocks ragged-right,
insert .na right before the starting .TS (and .ad after the table).
To change the data format within a table, use the .T& command (at the
start of a line). It is followed by format and data lines (but no
global options) similar to the .TS request.
INTERACTION WITH EQNtbl(1) should always be called before eqn(1) (groff(1) automatically
takes care of the correct order of preprocessors).
GNU TBL ENHANCEMENTS
There is no limit on the number of columns in a table, nor any limit on
the number of text blocks. All the lines of a table are considered in
deciding column widths, not just the first 200. Table continuation
(.T&) lines are not restricted to the first 200 lines.
Numeric and alphabetic items may appear in the same column.
Numeric and alphabetic items may span horizontally.
tbl uses register, string, macro and diversion names beginning with the
digit 3. When using tbl you should avoid using any names beginning
with a 3.
BUGS
You should use .TS H/.TH in conjunction with a supporting macro package
for all multi-page boxed tables. If there is no header that you wish
to appear at the top of each page of the table, place the .TH line
immediately after the format section. Do not enclose a multi-page ta-
ble within keep/release macros, or divert it in any other way.
A text block within a table must be able to fit on one page.
The bp request cannot be used to force a page-break in a multi-page ta-
ble. Instead, define BP as follows
.de BP.ie '\\n(.z'' .bp \\$1.el \!.BP \\$1..
and use BP instead of bp.
Using \a directly in a table to get leaders will not work (except in
compatibility mode). This is correct behaviour: \a is an uninterpreted
leader. To get leaders use a real leader, either by using a control A
or like this:
.ds a \a.TStab(;);lw(1i) l.
A\*a;B.TEREFERENCE
Lesk, M.E.: "TBL -- A Program to Format Tables". For copyright reasons
it cannot be included in the groff distribution, but copies can be
found with a title search on the World Wide Web.
SEE ALSOgroff(1), troff(1)
Groff Version 1.19.2 February 6, 2006 TBL(1)

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